(history) A particular system of measuring mass and volume.

(computing) A way programming language classifies values and expressions into types, how it can manipulate those types and how they interact.

(anatomy) The system of organs serving for respiration.

(astronomy) A method of stellar classification in which stars are assigned Greek letters (α, β, γ, etc.) in decreasing order of brightness.

(neuroanatomy) The part of the autonomic nervous system that raises blood pressure and heart rate, constricts blood vessels, and dilates the pupils when under stress.

A group of related components that are part of a larger system.

Do not change something while it is working.

(anatomy) Part of the human brain involved in emotion, motivation, and emotional association with memory; includes amygdala, cingulate gyrus, fornicate gyrus, hippocampus, hypothalamus, mammillary body, nucleus accumbens, orbitofrontal cortex and parahippocampal gyrus.

A hierarchy of values that all moral beings have, reflected in their choices. Most people's value systems differ. It's an individualistic concept. One's value system is molded by one's virtues or vices, and experiences.

A pushchair with detachable carrycot or car seat.